Stamp-mill



(No Mdel.) 2 Sheets-Sheen 2.

J. G. BUTTBRFIELD.

8 STAMP MILL. l No. 285,388. Patented Sept. 25, 1883.

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IINrrED STATES PATENT OEEicE.

JOHN C. BUTTERFIELD, OF CHICAGO, ILLINOIS.

STAM P-MILL.

SPECIFICATION forming part of Letters Patent No. 285,388, dated September 25, 1883.

Application filed May 1, 1833. (No model.) Y

Be it known that I, JOHN C. BUTTEREIELD, of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement Particularly Adapted to Stamp- Mills and I do hereby declare that the following is an accurate description of the same.

Vhen the pestle or stamp is long in action without rotation upon its aXis-the same surfaces of pestle and mortar being continually opposed to each other-unequal wear takes place, because the feed always comes from one and the same side, and therefore the harder labor is continually encountered by one side of the pestle. rIo avoid this unequal wear the pestles are rotated upon their axes. y The object of my invention is to produce an automatic rotation of the stamp-rod.

For convenience I will represent and describethe mechanism as I have applied it to j the pestle or stamp rod. of my stamp-mill,

heretofore patented to me August 3,1880, and numbered 230,611, having reference to the accompanying drawings, wherein- Figure l is a side elevation of a part of saidmachine, showing the front end of the walking-beam, with the stamp-rod and rotating device in position. Fig. 2 is an elevation of the same, partly in section. Fig. 3 represents in plan and elevation the pawl and its pivotl A is the walking-beam whereby the stamprod B iscaused to reciprocate. In the ordinary stamp-mills the stamp is elevated by the tappet and falls by its own weight, only so that the blow is due to gravity alone and the speed of delivery is limited. In my machine the blow is assisted by an application of positive force, and the stamp being under equally positive control, the blows can be repeated with much greater rapidity than is possible when gravity alone is calledinto play. It is required, however, to construct a joint between the stamp-rod and its moving lever A whichshall admit of the pounding action without being itself destroyed. In the patents heretofore grantedto me for inventions pertaining to this and similar subjects I constructed said j oint with an interposed mass of india-rubber to preventthis transmission of vibrations; but in this machine different means are used torender the joint durable, and at the said time to permit the revolution of the stamp-rod, as above described. Itherefore form on one stamp-rod B, near its upper end, a shoulder, (l, and make said rod cylindrical from said shoulder to its extremity, and iit a collar or ring, e, upon said shoulder. From the shoulder d, or thereabout, to the extremity of the rod B, I cut a groove or keyseat, f. Next above the collar e, I place the ratchet-disk G and secure it to the rod B by a key, h.. Next above the ratchet-disk G, I place the cross-head I, having in its opposite sides the sockets j for the joint-pins 7c, whereby the cross head is jointed to the beam; and above the cross-head I place the collar L, which is secured to the rod B by the key m in the keywayf. Therefore while the rod B may revolve freely in the cross-head I the ratchet-disk G and the collar L can only revolve with said rod. In order to reduce friction between these parts, it is advantageous to int-erpose the friction-rings n'. The collar L is held in position by a screw-nut, p, at the top of the rod. This is a general description of the cross-head j oint; but there are, in addition, some features of refinement, to which reference will be made. A groove, q, concentric to the axis, is turned in the upper end of the hub of the disk G, and the cross-head I is provided with' a corresponding rib fitting said groove. The friction-ring n is laid in said groove. In the bottom of the groove q severalpits, r, are drilled, to catch and hold oil, and the rings n themselves are perforated, so that oil'may freely pass from one surface to the other, and by the rapid reciprocations of the stamp-rod oil will be thrown from the lower to the upper surface through said perforations, and both sides of the friction-ring will'be thereby kept lubricated. per side of the cross-head I there is a groove similar to q, and upon the collar L a rib corresponding to and fitted in saidl groove, and a friction-ring, o1., is placed therein. In the revolution of the stamp-rod the rotary bearing-surfaces are these interlocking ribs and grooves. The sockets j are formed in tapering bushings t, which may be readily removed from the cross-head and be replaced with new ones if occasion requires.'

At the up- IOO Between the collar L and the 'nut p, I place a spring, which permits a slight elastic action in the cross-head connection, to relieve the shock in changing the direction of motion of the stamp-rod. For the purposes of this spring I prefer to employ a mass of india-rubber, and I confine it between the collar L and another similar collar, U, any required degree ot pressure being secured by the nut p.

The edge of the disk G is provided with ratchet-teeth, and a pawl, V, is pivoted to the beam A in line with the teeth of the ratchet at the point of their greatest lateral distance from the beam, and a point preferably more distant from the joint-pin k than the semi-diameter ot' the ratchet-disk. The pivotal point ot' the pawl moves in a curve the center of which is the axis ofthe wal king-beam A, and the rod B reciprocates in the tangent ot' the curve described by thc joint-pin 7;, andit follows that during the movements otthe. beam A the pawl-pi vot will alternately approach to and recede from said tangent and the angular position of said pivot, and the ratchet-disk will become correspondingly changed; hence the point of the pawl will be alternately thrust out andretracted at each rcciprocation, and being in enga-gement with the ratchet-teeth on the disk G, the latter will be pushed around or partly rotated by positive means at each reciprocation of the stampi-od. lt is occasionally necessary to lengthen the stamp-rod B to compensate thev wearing away ot' the surface of the stamp, and this I iind it convenient to do by removing the ring c and replac ing it with a thicker ring to lengthen the rod, or with a thinner one t shorten it. By making these rings and the adjacent surtaces interlocking grooves and ribs, as at q, said rings may be divided transversely and removed or inserted by merely raising or lowering the nut p, and without removing the rod B from the cross-head I.

Having described my invention, what I claim as new is- 1. The combination, in a stamp-mill, ot'theA Vfollowing instrumcntalities, to wit: the rotating stamp-rod B, the erosshead l, the disks L U, and spring S, above said cross-head and' rotating with said rod, the ratchet-disk G,

similarly attached to said rod below said crossu walking-beam A upon a. horizontal axis, substantially as described.

3. The cross-head I, walking-beam A, provided with the pins 7c, and the stamp-rod B, having shoulder d, and passing through and capable oi' rotation in said cross-head, combined with the disks G and L, located upon said stampsrod, and capable otlongitudinal movement, but incapable ot' rotation thereon, whereby said cross-head is eoniined, and a loose ring or rings, c, placed on said rod between said disk G and the shoulder d, whereby its eiiective length may be changed, as set forth.

4. The walking-beam A and stamp-rod B, combined with the disks G and L, each secured to said rod to prevent rotation thereon, the cross-head I, interposed between said disks and free to rotate on said rod, and means for securing these parts upon said stampiod, substantially as and for the purposes set forth.

5. The walking-beam A, stamp-rod B, the disks G L, and the cross-head I, secured upon said rod, as set forth, combined with frictionrings a, interposed as described.

(i. Thewalking-beam A, stamp-rod B, crosshead I, within which said rod may rotate, and the disks G and L, secured to saidrod, whereby said cross-head is coniined, combined with the spring S, substantially as and for the purpose set forth.

JOHN G. BUTTEHFIELD.

Vitnesses:

B. D. O. SMITH, J. C. TURNER. 

